Echinoderm is the common name given to any member of the phylum Echinodermata of marine animals. The adults are recognizable by their (usually five-point).
The Echinodermata are a major phylum of marine animals, and they provide many striking examples of inconsistencies between the apparent relationships of .
Adult echinoderms exhibit pentaradial symmetry and have a calcareous endoskeleton made of ossicles, although the early larval stages of all echinoderms have.
Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum The adult sea lily is sessile, using tentacles growing from its arms to feed.